Powder production
Spray-drying of solutions was carried out on a
pilot scale spray-dryer (L-8, Ohkawara Kakohki Co
Ltd., Yokohama, Japan) with a water evaporating
capacity of 1L/hr. The inlet and outlet temperatures
were maintained at 165oC and 65oC, respectively.
The powders were collected from cyclone and the
cylindrical part of the dryer chamber by lightly
sweeping the chamber wall (Bhandari et al.,
1997a). The yield was calculated as the ratio of the
mass of solids collected to the mass in feed solution
on a dry basis. Depending on the powder recovery
the best formulation was selected for further
studies.